Plinius SA250 or 2x SA100 monoblocks


Which would be better between 2 SA100 monoblocs or 1 SA250mkiv?? I've gotten different opinions from a number of people I respect!!
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How much power do you need? I've listened to both the SA-100 and the SA-250 (which I own). IMHO, I liked the effortless, dynamic sound of the SA-250. I didn't think the SA-100 had quite the "umph" that the SA-250 has. Both are very good SS amps.
Take Eugenio Costa's advice and try both set-ups before you invest. Or, just get 2 SA-250's now.
What about the SA250MkIII with siltech silver wire upgrade vs. an SA250MkIV? The MkIII can be had at bargain prices these days. Is the sonic difference between the two worth the difference?